All about opensource

To protect a directory with .htaccess in Fedora

2009-02-24T18:58:00.003+05:30

A folder or directory of the public documents can be protected to prevent unauthorized visitors from seeing its contents using "HTTP authentication"

Create a file named .htaccess in the directory you want to protect and put following into file:

AuthType Basic
AuthName "Secure Area"
AuthUserFile /etc/httpd/conf/htpasswdfile
Require valid-user

Save the file and exit.
Now create the htpasswd file at given location.

cd /etc/httpd/conf

htpasswd -c htpasswdfile admin

Here one user 'admin' and password file 'htpasswdfile' is being created with the command 'htpasswd'
It will prompt for password (2 times), supply the password.

## (Some how apache, the web server user is not able to read the password file if you place the file in /root and /home/ folder so keep the file in the location where the httpd.conf file is)

## Make sure AllowOverride is set to All in the httpd.conf file

Amazon EC2 Server Setup

2009-02-17T17:55:00.005+05:30

Assuming you already created account on AWS ans S3 so you will be having:
EC2 Private Key
EC2 Certificate Key
User ID
S3 access key
S3 secret key

Download Amazon EC2 API Tools from here:

The command line tools used here require Java version 5 or later to run. Either a JRE or JDK installation is acceptable.

Unzip it at some location.
Let say on /root/amazon
Also assuming you have your EC2 Private Key & EC2 Certificate Key at /root/amazon/ec2

Set these in your environment. Open .bash_profile file and add these entries as below:

PATH=............:/root/amazon/ec2-api-tools-1.3-30349/bin

export PATH
unset USERNAME

JAVA_HOME=/usr/local/jdk1.6.0_10
export JAVA_HOME

EC2_HOME=/root/amazon/ec2-api-tools-1.3-30349
export EC2_HOME

EC2_PRIVATE_KEY=/root/amazon/ec2/pk-xxxxxxx.pem
export EC2_PRIVATE_KEY

EC2_CERT=/root/amazon/ec2/cert-xxxxxxxxxx.pem
export EC2_CERT

After closing the .bash_profile file run the following command:
source .bash_profile

Finding a Suitable AMI:
ec2-describe-images -o self -o amazon | grep machine
ec2-describe-images | grep public

Generating a Keypair:
ec2-add-keypair gsg-keypair
Save the output content in a file (ex: id_rsa-gsg-keypair)

chmod 600 id_rsa_gsg-keypair

ec2-run-instances ami-86e90eef -k id_rsa_gsg-keypair
Note down the instance id (i-56a32e3f). This may be different for you.

ec2-describe-instances i-56a32e3f

(Note the Public URL ec2-174-129-185-64.compute-1.amazonaws.com, this may be different for you)

Authorizing Network Access to Your Instances:
ec2-authorize default -p 22
ec2-authorize default -p 80

Connecting to your Instance:

ssh -i id_rsa_gsg-keypair root@ec2-174-129-107-244.compute-1.amazonaws.com

root@my-instance #
After login to the ec2 server start the services
Start the Apache Web Server:
[root@ip-xx-xxx-xx-xxx:~] /etc/init.d/httpd start
Start the MySQl Server
[root@ip-xx-xxx-xx-xxx:~] /etc/init.d/mysqld start
Start the Asterisk Server
[root@ip-xx-xxx-xx-xxx:~] amportal start

Point the browser at:
http://ec2-174-129-107-244.compute-1.amazonaws.com/

Congratulations !! you have running Asterisk server with FreePBX and latest sugar.
To Access sugar:
http://ec2-174-129-107-244.compute-1.amazonaws.com/sugar52
(User/Pass: admin/admin)

Managing S3 account from Fedora or Linux machine

2009-01-22T12:09:00.001+05:30

Download S3 commands tool from SourceForge

(select tar file of the s3cmd to download)

Untar it some convenient location say /usr/local
cd /usr/local
tar ixzf s3cmd-0.9.8.x.tar.gz

It will create one dir s3cmd-0.9.8.x
cd s3cmd-0.9.8.x
python setup.py install

Create a configuration file:
s3cmd --configure

Supply your S3 account id and secret key

Follow the instructions...

Once config file is created you can use s3cmd.

How to use and other for general usage run the
s3cmd --help

Creating Virtual Hosts in Apache for Fedora

2008-11-24T16:05:00.004+05:30

In the /etc/httpd/conf/httpd.conf file add following line at the end or in the virtual host section.

NameVirtualHost *

# for domain mydomain1.com
< VirtualHost * >
DocumentRoot /var/www/vhosts/mydomain1/htdocs
ServerName mydomain1.com
ErrorLog /var/www/vhosts/mydomain1/logs/error_log
CustomLog /var/www/vhosts/mydomain1/logs/access_log common
< /VirtualHost >

# for domain mydomain2.com
< VirtualHost * >
DocumentRoot /var/www/vhosts/mydomain2/htdocs
ServerName mydomain2.com
ErrorLog /var/www/vhosts/mydomain2/logs/error_log
CustomLog /var/www/vhosts/mydomain2/logs/access_log common
< /VirtualHost >

Save end Close the file.

Create directories/files according to the virtual hosts defined in the httpd.conf file.

$ cd /var/www
$ mkdir vhosts
$ cd /var/www/vhosts
$ mkdir -p mydomain1/htdocs
$ cd mydomain1
$ mkdir logs
$ cd logs
$ touch error_log
$ touch access_log
$ cd mydomain1
$ chown -R apache:apache logs
$ chown -R apache:apache htdocs

Restart the web server (apache).

/etc/init.d/httpd restart

To teat the Virtual Host syntax:

$ /usr/sbin/httpd -S

(Output will be like below)

VirtualHost configuration:
wildcard NameVirtualHosts and _default_ servers:
*:* is a NameVirtualHost
port * namevhost mydomain1.com (/etc/httpd/conf/httpd.conf:1049)
port * namevhost mydomain2.com (/etc/httpd/conf/httpd.conf:1057)
Syntax OK

Virtual Host can be easily set and tested on Local Fedora / Redhat machine
In local Fedora/RH machine:

NameVirtualHost 127.0.0.1

< VirtualHost 127.0.0.1 >
DocumentRoot "/var/www/html"
ServerName localhost
< /VirtualHost >

< VirtualHost 127.0.0.1 >
DocumentRoot "/var/www/mysite"
ServerName mysite.com
< /VirtualHost >

Add the mysite.com in the /etc/hosts file (at the end)
127.0.0.1 localhost.localdomain localhost localhost
::1 localhost6.localdomain6 localhost6
127.0.0.1 mysite.com mysite.com

Restart the Apache.

Point your browser at:
http://localhost

It will display the content under /var/www/html dir

http://mysite.com/

It will display the content under /var/www/mysite dir

creating svn repository in Fedora

2008-11-04T19:04:00.003+05:30

Lets first install subversion (svn server packages) and Apache module for subversion:

$ yum -y install subversion mod_dav_svn

$cd /etc/httpd/conf.d/
$ vi subversion.conf

# Make sure you uncomment the following if they are commented out
LoadModule dav_svn_module modules/mod_dav_svn.so
LoadModule authz_svn_module modules/mod_authz_svn.so

# Add the following to allow a basic authentication and point Apache to where the actual
# repository resides.

DAV svn
SVNPath /var/www/svn/repos
AuthType Basic
AuthName "SVN Access"
AuthUserFile /etc/httpd/conf.d/svnpassowrd
Require valid-user

Add user who can access the repository:
$ htpasswd -cm /etc/httpd/conf.d/svnpassowrd user1
(It will ask for the apssword for the user 'user1')

$ htpasswd -m /etc/httpd/conf.d/svnpassowrd user2
(It will ask for the apssword for the user 'user2')

Create the repository:

$ cd /var/www/
$ mkdir svn
$ cd svn
$ svnadmin create repos
$ chown -R apache:apache repos
$ service httpd restart

Access repository from a web browser:
http://ip-address/repos
(It will ask the apache authentication user and password, supply the user/pass we created using htpasswd command)

Imporing a project into repository:
$ svn import /home/sanjay/testproj/ file:///var/svn/repos/testptoj -m "initial testproject"

Here "repos" is the svn repository (created by svnadmin create command) and "testproj" is one project inside this repository.
/home/sanjay/testproj is the folder containing all the files we want to be in repos.

Adding a dir tree in the existing repository.
Case: Although we can use the svn add/commit but if the dir is too big and there is no UI access for svn repository then
better use the "import" command of svn.

Now if we want to add "wiki" folder into the "testproj" then use the import as below"

$ svn import /home/sanjay/testproj/wiki/ file:///var/svn/repos/testproj/wiki -m "wiki folder in testproj"

Taking dump of svn repository

2008-07-24T16:53:00.002+05:30

This is for taking a dump of a existing svn repository and creating a svn repository on different server.

Take the dump of svn repo from svn.
If we want all the log history then no argument is needed.
$svnadmin dump /opt/svn/myrepo/ >myrepobackup

Copy this file to new server.

Create one repo on new server.
$ svnadmin create --fs-type fsfs /opt/svn/myrepo/
Load from the svn dump copy
$svnadmin load /opt/svn/myrepo < /root/Desktop/myrepobackup

This way we will get all the history log file of existing repository.

If we want dump of a particular revision the use:
$ svnadmin dump /opt/svn/myrepo -r 100 >myrepobackup100

For creating a repository read:
http://sanjaykatiyar1.blogspot.com/2007/06/add-svn-repository.html

CVS Installation on Ubuntu

2008-06-19T19:02:00.001+05:30

Login to server as root.
Install CVS files:
apt-get install cvs

Install the CVS server:
apt-get install cvsd

After installing some file it will prompt (UI) for your repository name.
By default it provides 2 repos
demo
myrepos

Either you can remove these and add one new or let it be there and add new one.
Let say add '/cvsrepo'. Click the OK to close the UI.

If the folder cvsrepo does not exist, then create it.
cd /var/lib/cvsd
mkdir cvsrepo

Initialize the repository
cvs -d /var/lib/cvsd/cvsrepo init

Create a user and password to access the cvs repository (cvsrepo):
cvsd-passwd /var/lib/cvsd/cvsrepo +cvsuser
(cvsuser is the user name who is going to access the cvs repo.
It will ask password for user 'cvsuser' supply the password)
If you want to add more user follow the same..

cvsd-passwd /var/lib/cvsd/cvsrepo +newuser

Change the following

vi /var/lib/cvsd/cvsrepo/CVSROOT/config

Change "SystemAuth=no"

Just make sure the cvsrepo is added.
Open the /etc/cvsd/cvsd.conf file

vi /etc/cvsd/cvsd.conf
Go to the end of the file.
If below line is there then its fine otherwise add the following line
Repos /cvsrepo

then restart cvsd:
/etc/init.d/cvsd restart

Give the right permission to the repo:
cd /var/lib/cvsd
chown -R cvsd:cvsd cvsrepo

Test installation:
cd to some dir

cvs -d :pserver:cvsuser@localhost:/cvsrepo login

cvs -d :pserver:cvsuser@localhost:/cvsrepo checkout .

If its checking out without any error then it means all is well.
Then you can create the projects (module) in cvsrepo.

How to insatll Java plugins in Firefox on Fedora

2008-05-29T19:56:00.000+05:30

Case 1: If you do not have have JDK >1.5 installed then download the jre for Fedora/Redhat from here:
http://java.com/en/download/help/5000010500.xml#download
And installed jre as steps given at same page.

Let say jre has been installed at /usr/java/jre1.6.0/

Case 2: If Firefox is installed as RPM then run the command:
$ cd /usr/lib/firefox-x.x.x.x/plugins
$ ln -s /usr/java/jre1.6.0/plugin/i386/ns7/libjavaplugin_oji.so

Case 3: If you already have JDK >1.5 installed then cd to jdk location.
Lets say jdk is insatlled at:
/usr/local/jdk1.5.0_09/
$ cd /usr/lib/firefox-x.x.x.x/plugins
$ ln -s /usr/local/jdk1.5.0_09/jre/plugin/i386/ns7/libjavaplugin_oji.so

Case 4: If Firefax has been installed manually then cd to firefox
Lets say Firefox is at /usr/local/firefox
$ cd /usr/local/firefox/plugins
$ ln -s /usr/local/jdk1.5.0_09/jre/plugin/i386/ns7/libjavaplugin_oji.so
or
$ ln -s /usr/java/jre1.6.0/plugin/i386/ns7/libjavaplugin_oji.so

Restart the Firefox:)

Using Jasper reports with Postgres database

2008-05-23T17:08:00.003+05:30

As Jasper reports has been written in Java we need JDK/JRE installed on machine.
Download jasper report from here (jasperreports-3.0.0-project.tar.gz)
http://sourceforge.net/project/showfiles.php?group_id=36382&package_id=28579

Open it at some convenient location lets say:
/usr/local
A folder will be created jasperreports-3.0.0

Here we are going to create reports from the Postgres sql so we need Java Postgres driver.
Download driver from here:
http://jdbc.postgresql.org/download.html
Select appropriate jar file, means if JDK is >1.4 <1.6 and Postgres >8.1 then
download the JDBC3 (postgresql-8.2-508.jdbc3.jar)
Place this file at /usr/local/jasperreports-3.0.0/lib folder.

There are many sample reports type availabe in the jasperreports-3.0.0/demo/samples
Let say we are interested in the Charts type of report (Bar, Pie and Line charts)

To connet to the postgres database open the ChartsApp.java file.
By defualt Jasper uses inbuilt HSQL db and below function does this:
private static Connection getConnection() throws ClassNotFoundException, SQLException
{
//Change these settings according to your local configuration
String driver = "org.hsqldb.jdbcDriver";
String connectString = "jdbc:hsqldb:hsql://localhost";
String user = "sa";
String password = "";

Class.forName(driver);
Connection conn = DriverManager.getConnection(connectString, user, password);
return conn;
}

Change it to something like this:
// for postgre sql db
private static Connection getConnection() throws ClassNotFoundException, SQLException
//Change these settings according to your local configuration

String driver = "org.postgresql.Driver";
String connectString = "jdbc:postgresql://localhost:5432/YOUR_PG_DB_NAME";
String user = "PG_USER_NAME";
String password = "PG_USER_PASSWORD";

Class.forName(driver);
Connection conn = DriverManager.getConnection(connectString, user, password);
return conn;
}

Now in any one of the jrxml file you can write your sql query depending upon the requirement.

installing webmin

2008-04-25T19:17:00.002+05:30

If you want to manage your server then its a good idea to install a control panel application like webmin.
Its easy to install on Redhat based systems like RH, Fedora or CentOS.

Download the rpm package from here:
http://www.webmin.com/download.html

Then run the command as su
rpm -U webmin-1.410-1.noarch.rpm

To access the webmin via browser:
http://Your_IP_Address:10000/
or
http://localhost:10000/

By default webmin uses 10000 port.

May be this port is blocked by firewall on your system, to open this port just add following line in the /etc/sysconfig/iptables file
[0:0] -A INPUT -p tcp -m tcp --dport 10000 -j ACCEPT

And restart the iptables
/etc/init.d/iptables restart

Get Google Applications for your domain

2008-03-11T11:36:00.002+05:30

Goolge provides many services like Gmail, Google Talk, Google Calendar, Google Docs, Google Sites
for a domain free of cost.

Here is the link, by this you can get the google mail, docs and other
services for your domain.

http://www.google.com/a/help/intl/en/admins/editions_spe.html

Select "Standard Edition" Free and follow the instructions.

At the last step it will create one text file which you have to copy in
html/htdocs/public_html folder of your domain.
Goolge will read this file and verify the domain.

Files, directories and database script comparison tool

2008-03-07T18:54:00.002+05:30

There is one UI based tool available for Linux which can be used for Files, database script and directory comparison; its "Aqua Data Studio".
Download the Linux version from here.

It requires JDK/JRE 1.5 or above.

After downloading the tar file extract it some location and run the datastudio.sh file.

Google Desktop on Linux

2008-02-21T12:04:00.002+05:30

Google is providing desktop search via Goolge Desktop. Its very easy to install on Linux machine.

Download rpm from here

Run the rpm as:

$rpm -ivh google-desktop-linux-current.rpm

After installing it will take some time for indexing the local hard disk.

Editing a file on Nano Editor

2008-02-11T13:00:00.000+05:30

Open the file with write mode

$ nano -w file_name

Modify the file
Press Ctrl+O, ENTER and Ctrl+X to Save and Exit the editor

Installation of CVS Server

2008-02-05T18:11:00.000+05:30

Most of the latest Linux distro comes with cvs installed.
Only you have to make some adjustment to make it running.

Check in your machine by typing:
$which cvs

If it returns some path then its there so please skip first two steps.

1. Take the rpm version of cvs server from
http://download.fedora.redhat.com/pub/fedora/linux/core/6/i386/os/Fedora/RPMS/

2. run the command as su
( I stored downloaded rpm at /home/sanjay/)
$rpm -ivh /home/sanjay/cvs-1.11.x-x.i386.rpm

It will install cvs at /usr/bin

Alternatively cvs can be installed via yum
$ yum install cvs

3. Create cvsroot directory

$mkdir /home/sanjay/projects

4. Set environment variable CVSROOT in root's .bash_profile
$ vi .bash_profile
(in .bash_profile file add lines)
CVSROOT=/home/sanjay/projects
export CVSROOT

(After saving & exiting the file run the command
$ source .bash_profile (to make the changes permanent)

5. Initialize CVSROOT
$ cvs -d /home/sanjay/projects init

It will create one directory named CVSROOT inside /home/sanjay/projects

6. Edit /etc/xinetd.conf file

Add following entry at the last:

service cvspserver
{
socket_type = stream
protocol = tcp
wait = no
user = root
env = HOME=/home/sanjay/projects
server = /usr/bin/cvs
server_args = --allow-root=/home/sanjay/projects pserver
disable = no

}

7. restart xinetd server

$ service xinetd restart

8. Add one user/group cvs, who owns the /home/sanjay/projects directory

$ adduser cvs

9. Give ownership of /home/sanjay/projects directory to this cvs user

chown cvs:cvs /home/sanjay/projects/

10. Give right permissions to the directory
$ chmod -R 2775 /home/sanjay/projects/

11. Add exiting user to the cvs group so they can access the repository

$ usermod -G cvs vivek

(assuming vivek user is already there)

12. Adding module to repository

Create folder say moodle inside /home/sanjay/projects/
and put all the projects file there

Like :
$mkdir /home/sanjay/projects/moodle

14. moodle will become the module inside repository that we can checkout and can checkin our files.

Solunas: The hotel management system

2008-02-01T17:46:00.000+05:30

Solunas is a Hotel Booking Engine Software written in RoR.

There are 2 separate parts of the whole application.
a) Backend: Solunas server for the admin of the property.
Its features are:
Manage your Properties / Rooms,
Manage the very flexible price system - Minimum stay / weekday match / etc

b) Frontend:A component integrated on Joomla for the end users.
Its features are:
Show availability calendars
Cart function to add multiple bookings
Checkout

Installation( Applicable on Linux, tested on Fedora 7)
I am assuming your machine has MySQL, Apache, Ruby and Rails installed.

Download the solunas from sourceforge

Extract it some where like /home/sanjay

Create one blank database on mysql.

There is one sql file solunas.sql inside solunas/db folder, dump this file against the mysql database created for solunas.

Check your ruby version:

$ rails -v

Then change the environment.rb file (inside config folder)
RAILS_GEM_VERSION = '1.1.6'

Also change the database.yml file:
development:
adapter: mysql
database: solunas
username: db_user
password: db_pass
host: localhost

Start the webrick server.

$ cd /home/sanjay/solunas
$ ruby script/server

Point your browser at:
http://localhost:3000/
Login as user 'marc' and password 'isemann'
And start managing your hotel.
:)

Introducing CodeMunch

2008-01-07T19:28:00.000+05:30

We have indroduced the web based application http://www.codemunch.com. CodeMunch is the innovative way to manage one's profile cum resume. In short CodeMunch is a resume builder. Our main targeted audiences are freshers from colleges of various streams, who struggle a lot to create their professional looking resume. In CodeMunch they can import their resume in different formats including PDF and doc.

Live to the present

2007-12-21T13:08:00.000+05:30

Borrowed from the Charvak;

While life is yours live joyously;
No one can avoid Death's searching eye:
When this body of ours is burnt,
How can it ever return again?

Or the very popular saying of Charvak:

Jab tuk jiyo sukh se jiyo
Chahe udhaar le ke Ghee piyo

A quick note on how to install Alfresco

2007-11-27T14:13:00.000+05:30

1. Install (if not already there) jre/jdk1.5x (no jdk-1.4x)

2. Set JAVA_HOME environment variable
In the .bash_profile file of root add these line at the last
JAVA_HOME=/Path_Of_Jdk1.5
export JAVA_HOME

3. Create a dir 'alfresco' in /opt

$cd /opt
$ mkdir alfresco

4. Download this file 'alfresco-community-tomcat-2.0.0.tar.gz' from
sourceforge
http://sourceforge.net/project/showfiles.php?group_id=143373

5. Untar the tar file at /opt/alfresco
$ cd /opt/alfresco
$tar -xzf /Path/alfresco-community-tomcat-2.0.0.tar.gz

6. Create one mysql database
$ cd alfresco/extras/databases/mysql
$ mysql -u root -p < db_setup.sql

7. Remove 3 files (default for HSQL) from here

$ cd /opt/alfresco/tomcat/shared/classes/alfresco/extension

custom-db-and-data-context.xml
custom-db-connection.properties
custom-hibernate-dialect.properties

8. Start the tomcat server and run the alfresco
$cd /opt/alfresco
$ alfresco.sh start

9. Point browser at
http://localhost:8080/alfresco

10. Stop alfresco
$cd /opt/alfresco
$ alfresco.sh stop

NetBeans IDE on Linux

2007-10-25T15:37:00.000+05:30

The NetBeans IDE is a free, open-source Integrated Development Environment for software developers.
The NetBeans IDE provides developers with all the tools they need to create professional
cross-platform desktop, enterprise, web and mobile applications.

To install NetBeans IDE on Linux (Steps given here are performed on FC7):

It needs Java SDK-1.5.x so first install Java SDK-1.5.x and the JAVA_HOME in the environment variable in the .bash_profile file

# Download NetBeans IDE from here.

Downloaded file be like this: netbeans-x_x_x-linux.bin

# Make the file executable

$ chmod +x netbeans-x_x_x-linux.bin
Run this file
$ ./netbeans-x_x_x-linux.bin

It will open the Launcher, accept the License and click Next.
Select the Java version you want to use with the IDE, specify the path where you want to install the NetBeans IDE.

It will install all the files in the selected folder to run the NetBeans IDE cd to the bin directory and run the command:

$ ./netbeans

Could not find default font "fixed" . X Server not starting

2007-10-17T11:47:00.000+05:30

If you encountered this problem in your linux then most probably this is because of there is no enough space left in your hard disk

Login as root in the text mode and check the hard disk space:

$ df -h

If available space is very low then delete some unwanted files/folder and make more space.

Restart your machine.

Breakout game for Linux

2007-10-15T14:41:00.000+05:30

Want to play your favorite BREAKOUT game on Linux box. Its open source clone version is available.

Download the sorce code from here .
Open the tar file and run the following commands in the terminal.

$cd lbreakout-x-xx
$ ./configure
$ make
$ make install

The executale will be installed at /usr/local/bin

RMagick installation on Fedoras

2007-09-27T18:37:00.000+05:30

RMagick requires ImageMagick and ImageMagick-devel libraries.
Your distribution may include at least some of these libraries by default and probably provides pre-built packages for the others. If not, these are available as source code tarballs from http://www.imagemagick.org/pub/delegates/.

Or you can install these using the yum command:

$yum install ImageMagick

$yum install ImageMagick-devel

RMagick also needs Windows TureType font, download the rpm from here:

http://www.zacharywhitley.com/linux/rpms/fedora/core/6/i386/msttcorefonts-2.0-1.noarch.rpm

Install this:
$ rpm -ivh msttcorefonts-2.0-1.noarch.rpm

Make a symbolic link the font dir to the place rmagick expects them:

ln -s /usr/share/fonts/msttcorefonts /usr/share/fonts/default/TrueType

Some applications based on RMagick also requires freeimage header files.
Download freeimage from here
http://freeimage.sourceforge.net/download.html
Unzip the file and cd to the freeimage dir and run following commands

# make
# make install

Now install RMagic using the gem

$ gem install RMagick --include-dependencies

Connecting Bluetooth devices

2007-08-30T11:31:00.000+05:30

Tested on FC7 running on Compaq Presario and Nokia-N73 and Sony w300i

Start the bluetooth device like mobile phone having bluetooth support.
Oviously device should have in-front of the Laptop.

Start the Bluetooth service on FC7.
System => Administration => Server Settings => Services => Bluetooth
Turn on the Wireless on FC7

Run the Bluetooth File Sharing
Applications => System Tools => Bluetooth File Sharing

To check whether FC7 is able to scan the mobile devices
Run at terminal:

$ hcitool scan

It will display the mobile name.

Now open the file browser to send file to mobile.

Right click on file => Send to => Bluetooth => Select the mobile name

In the Mobile it will ask for confirmation, click yes to accept the file from computer.

running mp3 and video on Fedora

2007-08-22T17:05:00.000+05:30

As default Fedora installation does not support player for MP3 and some video format like avi and MP4, we have to install either MPlayer or VLC to play these files.

To install MPlayer and VLC:

Copy the freshrpm from here

Install this rpm:

$rpm -ivh freshrpms-release-1.1-1.fc.noarch.rpm

Now install MPlayer and VLC

$ yum -y install mplayer vlc

After successful installation you get the 'MPlayer' and 'VLC media player' menu in the Applications => Sound and Video

installing and running memcached

2007-08-08T15:25:00.000+05:30

memcached is a general-purpose distributed memory caching system.
It is often used to speed up dynamic database-driven websites by caching data and objects in memory to reduce the amount the database needs to be read.

memcached is dependent on libevent library, so firstly download the source files for Libevent
from http://www.monkey.org/~provos/libevent/

Install libevent:

$ tar -xvf libevent-1.3c.tar.gz
$ cd libevent-1.3c
$ ./configure
$ make
$ make install

In Fedora the library (libevent-1.3c.so.1.0.3) will be installed at
/usr/local/lib
Create a link or copy this file to standard libarary location (/lib) of Fedora
$ cd /lib
$ ln -s /usr/local/lib/libevent-1.3c.so.1.0.3 libevent-1.3c.so.1

Download the latest memcached from http://www.danga.com/memcached/download.bml

$ tar -xzf memcached-1.2.2.tar.gz
$ cd memcached-1.2.2
$ ./configure
$ make
$ make install

Running:
$ memcached -h
(Will display various options)

To run as a deoman
$ memcached -d -u apache
Will start as daemon with default options Port(p): 11211 and Max memory (m) to use: 64MB

Create swap file in Fedora- Linux

2007-08-01T17:41:00.000+05:30

Swap file is used by the Kernel for Virtual Memory.
It is recommended to have swap size double of the RAM but if RAM is more than enough (>512 MB) then
smaller swap has no issue.

To know the actual memory (RAM) and already swap on a Linux box use the free command.

$ free
total used free shared buffers cached
Mem: 507956 489860 18096 0 9580 76876
-/+ buffers/cache: 403404 104552
Swap: 1012084 69668 942416

Now to create extra swap file follow the steps:
(To create swap file of approx 1GB)

$ dd if=/dev/zero if=/usr/more_swap bs=1000000 count=1024

(It will create one swap file more_swap in /usr)

$ chmod 600 /usr/more_swap
$ mkswap /usr/more_swap
$ swapon /usr/more_swap

Now add this file to the /etc/fstab file (at last)
$ vi /etc/fstab

/usr/more_swap swap swap defaults 0 0

Installing and running Nagios

2007-07-17T11:50:00.000+05:30

Download latest & stable nagios from here. Select the tarball
Download
Also download the plugins

Here these steps have been performed on Fedora 2 and Fedora5 using the nagios-2.9 and nagios-plugin-1.4.9.

Add one user nagios and one group nagcmd
$adduser nagios
(There is no need of assigning password to this user as this user is not going to login to the
system)
$groupadd nagcmd

Add user nagios and web server user apache to this group
(To know who is the owner of web server
$grep "^User" /etc/httpd/conf/httpd.conf
)

$usermod -G nagcmd nagios
$usermod -G nagcmd apache

$cd /usr/local/
Create one dir to hold all the nagios files
$ mkdir nagios
Change ownership of this dir to nagios
$chown -R nagios:nagios nagios

Untar the downloaded nagios tar file
$tar -xzf nagios-x.x.tar.gz

It will create one dir nagios-x.x inside the /usr/local
$cd nagios-x.x/

Configure the nagios and install
$./configure --prefix=/usr/local/nagios --with-cgiurl=/nagios/cgi-bin --with-htmurl=/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-command-group=nagcmd
$make all
$make install
$make install-init
$make install-commandmode
$make install-config

Installing Plugins
$ cd /usr/local

Untar the downloaded nagios plugin
$tar -xzf nagios-plugins-1.x.x.tar.gz
$cd nagios-plugins-1.x.x/

Configure the nagios plugin, and install plugins
$./configure --prefix=/usr/local/nagios
$make
$make install

Plugins will be installed at
/usr/local/nagios/libexec

Setup The Web Interface

Configure Aliases and Directory Options For The Web Interface
Add these line (at last) in the httpd.conf file (at /etc/httpd/conf dir)

ScriptAlias /nagios/cgi-bin /usr/local/nagios/sbin



    Options ExecCGI
    AllowOverride None
    Order allow,deny
    Allow from all
    AuthName "Nagios Access"
    AuthType Basic
    AuthUserFile /usr/local/nagios/etc/htpasswd.users
    Require valid-user


Alias /nagios /usr/local/nagios/share


    Options None
    AllowOverride None
    Order allow,deny
    Allow from all
    AuthName "Nagios Access"
    AuthType Basic
    AuthUserFile /usr/local/nagios/etc/htpasswd.users
    Require valid-user

Restart the webserver
$ /etc/init.d/httpd restart

Configure Web Authentication
$htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

(Enter the password)

Rename the config sample file
Nagios creates sample configurtion files at /usr/local/nagios/etc
Rename these files
$cd /usr/local/nagios/etc
$mv nagios.cfg-sample nagios.cfg
...and so on

Start nagios
$/etc/init.d/nagios start

After changing any config file check the main nagios.config
$ /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

It will display any syntax error in any config file with file name and line number, rectify the errors and reload the nagios.

$/etc/init.d/nagios reload

Point your browser at:

http://localhost/nagios

It will ask for apache authentication, supply the user: nagiosadmin and password

Himmat karne walon kee haar nahin hoti

2007-07-12T00:59:00.000+05:30

add svn repository

2007-06-29T17:55:00.001+05:30

1. add one svn user and group

$ useradd svn -c "SVN Owner" -s /bin/false
(-c comment, -s shell , here no shell access)

2. If we want more than one repository then add group for each one.

$ groupadd reposgp
$ usermod -G reposgp svn
(Add this group to svn user/group)

3. Create a Subversion repository

We are creating it at /var ; svn will be the folder containing all repos
$ install -v -m 0755 -o svn -g svn -d /var/svn
$ svnadmin create --fs-type fsfs /var/svn/repos

(Here 'repos' will be our repos)

Now we can import some files/dir to the repos

$ svn import -m "Initial import." /path/to/source/tree
file:///var/svn/repos

Now change owner and group information on the repository, and add
an unprivileged user to the svn and reposgp groups:

$ chown -R svn:odotgp /var/svn/repos
$ chmod -R g+w /var/svn/repos
$ chmod g+s /var/svn/repos/db
$ usermod -G svn,repsogp sanjay

(here sanjay is already a user in the system)

We can verify the existing groups of user with the commands

$ groups sanjay

Regular Expressions

2007-06-18T12:47:00.000+05:30

Regular Expression:

^ : Matches the Beginning of string
$ : Matches the End of string
(): Parentheses, define the scope and precedence of Operators

Quantification: How often the preceding expression is allowed
There are 3: ?, * and +

?: 0 or 1 [ colou?r will match color or colour ]
*: 0, 1 or any number [ go*gol will match ggol, gogol, googol, gooogol etc ]
+: at least 1 [ go+gol = gogol, googol, gooogol etc ]

{n}: Repeat n times the previous exp

Examples:

1xx : ^1[0-9]{x}
21xx or 22xx: ^2[12][0-9]{2}
3xxxxxxxxxx, 4xxxxxxxxx, 9xxxxxxxxx (10 digits telephone number starting with 3, 4 or 9)
^[349][0-9]{9}

Setting a Crontab

2007-06-14T16:34:00.000+05:30

Syntax:

* * * * * command

# Use the hash sign to prefix a comment
# +---------------- minute (0 - 59)
# |  +------------- hour (0 - 23)
# |  |  +---------- day of month (1 - 31)
# |  |  |  +------- month (1 - 12)
# |  |  |  |  +---- day of week (0 - 7) (Sunday=0 or 7)
# |  |  |  |  |
# *  *  *  *  *  command to be executed

Crontab Example
_______

A line in crontab file like below removes the tmp files from /home/someuser/tmp each day at 6:30 PM.

30 18 * * * rm /home/someuser/tmp/*

Changing the parameter values as below will cause this command to run at different time schedule below :

min	hour	day/month	month	day/week	Execution time
30	0	1	1,6,12	*	-- 00:30 Hrs on 1st of Jan, June & Dec.
:
0	20	*	10	1-5	--8.00 PM every weekday (Mon-Fri) only in Oct.
:
0	0	1,10,15	*	*	-- midnight on 1st ,10th & 15th of month
:
5,10	0	10	*	1	-- At 12.05,12.10 every Monday & on 10th of every month
:

By default cron jobs sends a email to the user account executing the cronjob. If this is not needed put the following command At the end of the cron job line .

>/dev/null 2>&1

Happy Bday to Shlok

2007-05-17T13:33:00.000+05:30

My son Muthu aka Shlok just celebrated his first birthday at 12th May

bugzilla installation on Fedora

2007-05-16T18:47:00.000+05:30

Download latest stable Bugzilla from here
Untar the package at /var/www/html folder
$ tar -xzf bubzilla.x.x.tar.gz

Bugzilla's installation process is based on a script called checksetup.pl. The first thing it checks is whether you have appropriate versions of all the required Perl modules. The aim of this section is to pass this check. When it passes, proceed to Section 2.2.

To check you have the required modules, run:

bash# ./checksetup.pl --check-modules

checksetup.pl will print out a list of the required and optional Perl modules, together with the versions (if any) installed on your machine. The list of required modules is reasonably long; however, you may already have several of them installed

$ perl -MCPAN -e 'install ""'

Create one database in mysql with user/passord

Change the localcongif file of bugzilla (db related)

Run the
./checksetup.pl

Change the apache httpd.conf file add

AddHandler cgi-script .cgi
Options +Indexes +ExecCGI
DirectoryIndex index.cgi
AllowOverride Limit

Restart the webserver
Point browser at
http://localhost/bugzilla

Favorite Hindi books

2007-05-07T17:22:00.000+05:30

1. Shekhar - Ek Jeevani (part 1)- Agyey

2. Shekhar - Ek Jeevani (part 2)- Agyey

3. Nadi ke Dweep - Agyey

4. Apane-apane ajnabi- Agyey

5. Yayaati - Vishnu Sakharaam Khandekar

6. Rag-Darbaari - Shree Laal shukla

7. Vishrampur ka Sant - Shree Laal shukla

8. Mujhe Chaand Chahiye - Surendra Verma

9. Mratunjay - Vishnu Sawant (Hindi)

10. Yatha-sambhav - Sharad Joshi

11. Vaishnav Ki Fislan: Harishankar Parsai

12. Gunaho ka Devata - Dharmveer Bharati

13. Aur Ant mein Prarthana- Udai Prakash

14. Tastari mein toofan: Meenaxi Puri

15. Apka Bunty : Mannu Bhandari

16. Saara Akash : Rajendra Yadav

17. Warren Hastings Ka Saand : Udai Prakash

18. Zindaginama : Krishna Sobti

19. Ghaalib Chuti Sharab: Ravindra Kaaliya

20. Chaak: Maitreyi Pushpa

21. Edennmam: Maitreyi Pushpa

22. Mitro Marjani: Krishna Sobti

23. Paul Gomara ka scooter: Udai Prakash

24. Maila Aanchal: Renu

25. Sunita : Jainendra

26. Peeli Chhatri Wali Larki: Udai Prakash

27. Tirich: Udai Prakash

28. Andha Yug: Dharam Vir Bharti

29. Dilo Daanish: Krishna Sobti

30. Kasap: Shyam Manohar Joshi

31. Tyaag Patra: Jainendra

Install Alfresco from the Source Code in Fedoras

2007-04-23T19:04:00.000+05:30

1. Install Java 1.5x
If you dont have the java downlaod it from
here

2. Install Tomcat 5.2x
Take tomcat 5 from
here

3. Install Ant 1.6x
Download latest Ant from
here

4. Set these Environment Variables: In Redhat/Fedora linux these vales can be
set in .bash_profile file
JAVA_HOME
TOMCAT_HOME
VIRTUAL_TOMCAT_HOME
(For virtual tomcat you need to install one more tomcat 5.2x)

5. Checkout Source Code from here:
$svn co svn://svn.alfresco.com/alfresco/HEAD
$cd HEAD/root/projects/installer/HEAD
(delete 3 files custom*)

6. $cd HEAD/root/
ant build-tomcat
This will create one alfresco.war file and copy it to the
TOMCAT_HOME/webapps/

7. copy mysql-java connector jar file form
HEAD/root/projects/3rd-party/lib/devenv/mysql-connector-java-5.0.3-bin.jar
to TOMCAT_HOME/common/lib

8. Create one alfresco database and grant all to alfresco user
Connect to mysql as root
mysql>create database alfresco;
mysql>grant all on alfresco.* to alfresco@localhost identified by 'alfresco';
mysql>grant all on alfresco.* to alfresco@localhost.localdomain identified by 'alfresco';

9. As default memory (heap size) allocated by tomcat for java is less than required to run the alfresco sp increase the heap size.Edit the tomcat/catalina.sh file and make

$_RUNJAVA.... line like this
$_RUNJAVA -Xmx512M $JAVA_OPTS $CATALINA_OPTS

10. Start Tomcat
$./catalina.sh run &

11. Point Browser to:
http://localhost:8080/alfresco

Change sugarCRM password from backend

2007-04-20T11:06:00.000+05:30

If you forget your sugar admin password then dont be panic.
Can reset it from the mysql backend.

Connect to your sugar mysql database and execute this query:

For sugar version < style="font-family:verdana;">
update users set user_password=MD5('NewPass') where user_name='admin';

For sugar version >= 45
update users set user_hash=MD5('NewPass') where user_name='admin';

Install Java on Linux Machine

2007-04-18T14:51:00.000+05:30

Download the latest JDK from http://java.sun.com/javase/downloads/index.jsp
Select jdk-xxx.xx.Linux.xxx.bin to download for Linux machine

This is a binary file so execute this file.

$ cd /usr
$ ./jdk-xxx.x-linux-i586.bin

Edit your bash profile file to set the Java home.

$cd
$vi .bash_profile
Add/edit these lines
PATH=/usr/jdk-xxx-x.x/bin

JAVA_HOME=/usr/jdk-xxx-x.x/
export JAVA_HOME

#Save and Exit from the vi

$source .bash_profile

Check the java version
$ java -version